prometheus

Commit Graph

Author	SHA1	Message	Date
Fiona Liao	fd62dbc291	Update chunk format docs with native histograms and OOO Signed-off-by: Fiona Liao <fiona.liao@grafana.com>	1 year ago
Arve Knudsen	d699dc3c77	Fix language in docs and comments (#14041 ) Fix language in docs and comments --------- Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com> Co-authored-by: Björn Rabenstein <github@rabenste.in>	2 years ago
Ganesh Vernekar	50ae4e298b	Fix magic number in docs (#7998 ) Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>	5 years ago
Simon Pasquier	d634785944	tsdb/docs: fix head chunks directory + link from README (#7309 ) Signed-off-by: Simon Pasquier <spasquie@redhat.com>	6 years ago
Ganesh Vernekar	d4b9fe801f	M-map full chunks of Head from disk (#6679 ) When appending to the head and a chunk is full it is flushed to the disk and m-mapped (memory mapped) to free up memory Prom startup now happens in these stages - Iterate the m-maped chunks from disk and keep a map of series reference to its slice of mmapped chunks. - Iterate the WAL as usual. Whenever we create a new series, look for it's mmapped chunks in the map created before and add it to that series. If a head chunk is corrupted the currpted one and all chunks after that are deleted and the data after the corruption is recovered from the existing WAL which means that a corruption in m-mapped files results in NO data loss. [Mmaped chunks format](https://github.com/prometheus/prometheus/blob/master/tsdb/docs/format/head_chunks.md) - main difference is that the chunk for mmaping now also includes series reference because there is no index for mapping series to chunks. [The block chunks](https://github.com/prometheus/prometheus/blob/master/tsdb/docs/format/chunks.md) are accessed from the index which includes the offsets for the chunks in the chunks file - example - chunks of series ID have offsets 200, 500 etc in the chunk files. In case of mmaped chunks, the offsets are stored in memory and accessed from that. During WAL replay, these offsets are restored by iterating all m-mapped chunks as stated above by matching the series id present in the chunk header and offset of that chunk in that file. Prombench results _WAL Replay_ 1h Wal reply time 30% less wal reply time - 4m31 vs 3m36 2h Wal reply time 20% less wal reply time - 8m16 vs 7m _Memory During WAL Replay_ High Churn: 10-15% less RAM - 32gb vs 28gb 20% less RAM after compaction 34gb vs 27gb No Churn: 20-30% less RAM - 23gb vs 18gb 40% less RAM after compaction 32.5gb vs 20gb Screenshots are in [this comment](https://github.com/prometheus/prometheus/pull/6679#issuecomment-621678932) Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>	6 years ago
Ganesh Vernekar	e50fdbc70c	Live m-mapping of chunks on disk (#6830 ) * Live m-mapping of chunks on disk Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in> * Fix review comments Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in> * Fix review comments Part 2 Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in> * Fix review comments Part 3 Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in> * Fix review comments Part 4 Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in> * Attempt to fix windows bug Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>	6 years ago
zhulongcheng	e081406b5b	tsdb: update chunks format (#6033 ) Signed-off-by: zhulongcheng <zhulongcheng.dev@gmail.com>	6 years ago
Ganesh Vernekar	7cf09b0395	Moving tsdb into its own subdirectory Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>	6 years ago
zhulongcheng	db9177de0c	docs: add multi chunks layout in chunks readme file (#567 )	7 years ago
Catalin Patulea	b4c7c80227	Reword chunk references, LSB usually means 'bits'. (#364 ) https://en.wikipedia.org/wiki/Bit_numbering#Least_significant_bit Signed-off-by: Catalin Patulea <catalinp@google.com>	7 years ago
Shubheksha Jalan	faecfac2fa	update docs, rename docs folder, add error condition	8 years ago
Sunny Klair	4fdf9b195c	Validate index TOC checksum on read	8 years ago
Fabian Reinartz	2032a11d98	Add padding between fixed-sized index sections	9 years ago
Fabian Reinartz	34ba92eeeb	Move CRC back to chunks file, alignment for fixed-sized ints	9 years ago
Fabian Reinartz	35b62f001e	Change offset table layout, add TOC, ...	9 years ago
Fabian Reinartz	433e73f865	Change series and symbol table format	9 years ago
Fabian Reinartz	d8b91b969c	docs: add chunk file format	9 years ago

6 Commits (bwplotka-patch-1)